Lock mechanism



April 1958 H. 'r. BACKHOUSE 2,831,337

LOCK MECHANISM Filed Aug. 25, 1955 5 Sheets-Sheet l April 22, 1958 H. T.BAcKHousi-E LOCK MECHANISM 1 3 Sheets-Sheet 2 Filed Aug. 25, 1955 April22, 1958 H. T. BACKHOUSE 2,831,337

LOCK MECHANISM Filed Aug. 25, 1955 3 Sheets-Sheet 5 Unite States PatentLOCK MECHANISM Headley Townsend Backhonse, Nassau, Bfiamas, British WestIndies Application August 25, 1955, Serial No. 530,581

6 Claims. (Cl. 70-150) This invention relates to locks for doors orother closure members of the kind having a bolt which normally extendsfrom a casing (e. g. for engagement in a socket, keeper or the like on aframe for the closure member or on a post or equivalent) but may bewithdrawn inwardly of the casing to a release position, a keyoperatedlock of the rotatable, barrel type accessible at one side of the casingfor operation and means operable by the barrel lock by which the boltmay be locked in the extended position. Such locks will be hereinafterreferred to as door locks of the kind described and are commonlyconstructed as mortice locks, although the invention is not restrictedto mortice locks but includes, for example, rim locks.

The invention provides a door lock of the kind described which ischaracterised by the feature that the barrel-lock-operated meanscomprise an abutment member which is movable by operation of the barrellock to and from a bolt-holding position in which it lies in the path ofwithdrawal of the bolt thereby to hold the bolt in the extendedposition, by the provision of lostmotion between the barrel lock and theabutment member permitting movement of the member to the boltholdingposition independently of the barrel lock when the barrel lock is in itsunlocked position and by handleoperated means accessible at the oppositeside of the casing by which the member may be moved to and from thebolt-holding position without operation of the barrel lock when thelatter is in its unlocked position.

In one form of the invention the abutment member is in the form of anarm which is rotatable in one direction from a neutral position to thebolt-holding position and, in the other direction from the neutralposition, to withdraw the bolt to the release position. The arrangementmay be that the barrel lock may, in addition to effecting movement ofthe arm to the boltholding position as aforesaid, also be operative torotate the arm to withdraw the bolt to the release position. Thehandle-operated means may also be arranged to be operable to rotate thearm to withdraw the bolt to the release position.

In another form of the invention the abutment member is a slide guidedfor movement in the casing in a direction transverse to the direction ofmovement of the bolt and there is a cam which is rotatable by the barrellock and by the handle operated means to move the slide in at least onedirection. The cam, in this form of the invention, may operate on theabutment member through a lever. The lock may include means forwithdrawing the bolt to the release position operable by an additionalhandle at one or each side of the lock casing.

In order to hold and to locate the barrel lock there may be provided ineach of the above forms of the invention, a block of angular shape forreception within a corner of the casing the block having a hole withinwhich the barrel of the key lock is received and the wall at one side ofthe hole being split and there is a ire Preferably the block is alsoattached to a wall of the casing for example, by one or more screws.

Two specific constructions of mortice door locks according to theinvention will now be described by way of example of how the inventionmay be carried into effect and with reference to the accompanyingdrawings in which:

Figure 1 is an elevation of one of the locks with the cover plate of thelock casing removed;

Figure 2 is a view similar to Figure 1 but showing the lock with thebarrel lock and holding block removed;

Figure 3 is a section on the line 3--3 in Figure 1;

Figure 4 is a section on the line 44 in Figure 2;

Figure 5 is a view of the front of the lock with a cover plate omitted;

Figure 6 is an elevation of the other of the looks with the cover plateof the lock casing removed;

Figure 7 is a view similar to Figure 6 but showing the key-lock andholding block removed;

Figure 8 is a section on the line 88 in view 6;

Figure 9 is a section on the line 9-9 in Figure 6; and

Figure 10 is a section on the line 1010 in Figure 6.

The lock shown in Figures l-S comprises a rectangular casing 12 whichincludes a detachable cover plate 1.3.v Slidable within the casing thereis a latch-b0lt14 having a chamfered bolt head 15 which normallyprotrudes from the casing for engagement with a socket or keeper on thedoor frame. urges the latch bolt outwardly of the casing.

Pivotally supported within the casing there is a lever arm or pawl 20,the pivotal support consisting of a boss 21 on the lever received withina hole in the wall 22 of the casing. The boss 21 has a square socket 24for engagement by a square operating spindle attached to an operatinghandle. The free end 25 of the arm is arranged, in one position of thearm as shown in full lines in Figure 2, to engage an abutment 26 on thelatchbolt 14 so that rotation of the arm in the clockwise direction asviewed in Figure 2 will withdraw the latch- 4 bolt head 15 inwardly ofthe casing. When the lever arm is rotated anti-clockwise to the chainline position I shown in Figure 2, the free end of the arm is positionedin the path of an abutment surface 28 on the latch-bolt and the arm thenserves as a strut preventing inward movement of the bolt. Projectingfrom the arm. there is a pin 3!) for a purpose later described. A latch31 is pivoted at 32 to the casing and operable by a finger piece 33projecting from the front of the casing to engage behind a tongue 34 onthe latch-bolt, as shown in dotted lines in Figure l, to hold the boltin the Withdrawn position.

Located in the bottom 'rear corner of the casing thereis a square block36 which is held to the cover 13 by screws. The block has a hole 37within which is received the end 38 of the barrel of a key operated lock39. The 7 block 36 is divided at 40 and .a stepped screw 41 passesthrough the side of the block on one side of the division and engages ascrew thread 42 in the block on the other side of the division. The headof the screw is accessible cylinder 46 of the lock carries at the innerend'aplate 47 which is operable to engage the pin 30 and by rotation ofthe cylinder to'rockthe lever arm 20 between the two positions shown inFigure 2. The plate 47 has abut A spring around a bolt 16 ment faces47a, 47b for engagement with the pin 30, the faces being spaced about180 apart whereby there is nearly 180 of lost motion between the barrellock and the arm 20. This lost motion has three functions. Firstly andassuming the barrel lock is in the position as shown, it permits the armto be moved clockwise (as viewed in Figure 2) by means of the operatinghandle and square spindle and thereby to withdraw the latch-bolt to therelease position, without interference with the barrel lock. Secondly itpermits the arm 20 to be turned anticlockwise by the handle into thebolt-holding locking position shown in chain lines, again withoutinterference with the barrel lock. Thirdly it enables the barrel lock,after anti-clockwise rotation to move the arm 20 to the boltholdinglocking position, to be returned freely to the position shown, at whichthe key may be inserted and withdrawn.

In the second example shown in Figures 6-l0 there is a rectangular lockcasing 50 and a latch-bolt 51 which is slidable in the casing in thedirection to withdraw the latch-bolt head 52 inwardly of the casing.There are two operating lever arms 54-55 which are independentlyrotatable by square spindles operating in sockets 56, 57 and rotatableby handles on the two sides of the door respectively. The lever armsengage a tongue 58 on the latch-bolt and each arm may operateindependently of the other arm to withdraw the bolt. A stop pin 60 isprovided to prevent one or both of the lever arms being moved in theclockwise direction from the position shown in Figure 6, the stop pinbeing insertable into either side of the casing.

Located within the casing there is a square block 62 which is of similarconstruction to the block described in the previous example and isarranged to hold a barrel lock 63. The barrel lock is clamped and theblock is held by a screw 64 as in the previous example. The cylinder ofthe barrel lock is arranged to rotate an operating arm 65. This arm isarranged to engage two pins 67 and 68 on the side of a cam disc 69. Thedisc has the form of a major segment of a circle and is rotatable aboutthe centre of the circle by the arm when in engagement with one or otherof the pins 67, 68. The pins 67, 68 are spaced about 180 apart so thearm 65 has substantial lost motion between the pins.

Pivotally supported from the casing at 70 and above the disc 69 there isa lever 72 having a dependent projection 72a which engages the peripheryof the disc 69. The free end of the lever engages in a transverse slot73 in a slide 74 which is guided for vertical movement within the casingon a rail 76 secured to the side wali of the casing. The cam disc 69 mayalso be rotated by means of a handle 77 on the opposite side of the lockcasing to the barrel lock 63. A stop pin 78 limits the rotation of thecam disc 69 by engagement with the fiat face thereof.

In use the latch-bolt may normally be withdrawn by anti-clockwisemovement of either of the lever arms 54, 55 by means of its appropriateoperating handle. When it is required to lock the latch-bolt, thecylinder of the barrel lock is rotated to efiect rotation of the camdisc 69 from the position shown in Figure 6 to that shown in Figure 7.This causes the lever arm 72 to rise and so to raise the slide 74 to theposition shown in Figure 7 in which it lies in th path of an abutmentsurface 79 on the latch-bolt and so acts as a positive stop preventingwithdrawal of the latch-bolt. In view of the lost-motion between the arm65 and the two pins 67 and 68 the arm may be returned to the uprightposition at which the key of the lock may 'be withdrawn, withoutoperation of the cam disc, so that the latch-bolt remains locked. Whenthe arm is in the upright position (as shown in Figure 6) the handle 77may be employed to rotate the cam 69 to raise and lower the slide.

I claim:

1. A door lock comprising a generally rectangular, shallow, lock casing,a slide having a bolt head at one end thereof and guided in the casingfor sliding movement of the head inwardly and outwardly of a side wallof the easing, a block of angular shape received and secured within onecorner of the casing, said block having a cylindrical hole perpendicularto the faces of the casing and being split at one side, screw clampingmeans for closing the split and thereby to contract the hole, akey-operated barrel lock having a cylindrical casing fitting within saidhole and held therein by contraction thereof as aforesaid, movable stopmeans for dead-locking the bolt slide and an operative connectionbetween said barrel lock and said stop means whereby said barrel lockmay be operated to move the stop means into and out of its dead lockingposition.

2. A door lock as claimed in claim 1 in which the screw means areaccessible for operation from the front side wall of the casing and theedge of the door when the casing is in position.

3. A latch lock for a door or like closure member comprising a lockcasing, a latch bolt having a chamfered head and guided in the casingfor sliding movement of the head inwardly and outwardly of the casing,said bolt also having an abutment surface facing in the direction ofinward movement, spring means urging the bolt head outwardly of thecasing, a stop member and means for guiding the stop member within thecasing for sliding movement transverse to the movement of the boltbetween a position in which it lies in the path of said abutment surfaceand so acts to dead lock the bolt and a position in which it is clear ofthe bolt and leaves the bolt free forinward and outward latchingmovement, a handle at one side of the casing, a connection between thehandle and the stop member for moving the member between the twopositions aforesaid comprising a cam rotatable by the handle andoperative to effect movement of the slide, a key operated lock of thetype having a rotatable barrel and a single key-insertion and removalposition, said key operated lock being accessible for operation at theopposite side of the casing and an operative connection between saidrotatable barrel and said stop member for moving the stop member betweenthe two positions aforesaid comprising a connection between the lockbarrel and the cam having suiiicient lost-motion to enable the barrel tobe turned without movement of the stop member to the key insertion andremoval position after movement of the stop member to either of its twopositions aforesaid.

4. A latch lock for a door or like closure member comprising a lockcasing, a latch bolt having a chamfered head and guided in the casingfor sliding movement of the head inwardly and outwardly of the casing,said bolt also having an abutment surface facing in the direction ofinward movement, spring means urging the bolt head outwardly of thecasing, a stop member and means for guiding the stop member Within thecasing for sliding movement transverse to the movement of the boltbetween a position in which it lies in the path of said abutment surfaceand so acts to dead lock the bolt and a position in which it is clear ofthe bolt and leaves the bolt free for inward and outward latchingmovement, a handie at one side of the casing, a connection between thehandle and the stop member for moving the member etween the twopositions aforesaid comprising a cam rotatable by the handle andoperative to effect movement of the slide, a key operated lock of thetype having a rotatable barrel and a single key-insertion and remo aiposition, said key operated lock being accessibis for operation at theopposite side of the casing and an operative connection between saidrotatable barrel and said stop member for moving the stop member betweenthe two positions aforesaid comprising a connection between the lockbarrel and the cam consisting of an arm on the barrel which engages,with lost motion, between abutments on the cam, the lost motion beingsufficient to enable the barrel to be turned without movement of thestop member to the key insertion and removal position after movement ofthe stop member to either of the two positions aforesaid.

5. A latch lock for a door or like closure member comprising a lockcasing, a latch bolt having a chamfered head and guided in the casingfor sliding movement of the head inwardly and outwardly of the casing,said bolt also having an abutment surface facing in the direction ofinward movement, spring means urging the bolt head outwardly of thecasing, a stop member and means for guiding the stop member within thecasing for sliding movement transverse to the movement of the boltbetween a position in which it lies in the path of said abutment surfaceand so acts to dead lock the bolt and a position in which it is clear ofthe bolt and leaves the bolt free for inward and outward latchingmovement, a handle at one side of the casing, a connection between thehandle and the stop member for moving the member between the twopositions aforesaid comprising a lever with pivoted connection to thecasing and the slide and a cam operative through the lever to eifectmovement of the slide, a key operated lock of the type having arotatable barrel and a single key-insertion and removal position, saidkey operated lock being accessible for operation at the opposite side ofthe casing and an operative connection between said rotatable barrel andsaid stop member for moving the stop member between the two positionsaforesaid comprising a connection between the lock barrel and the camhaving sufficient lost motion to enable the barrel to be turned withoutmovement of the stop member to the key insertion and removal positionafter movement of the stop member to either of its two portionsaforesaid.

6. A latch lock for a door or like closure member comprising a lockcasing, a latch bolt having a chamfered head and guided in the casingfor sliding movement of the head inwardly and outwardly of the casing,said bolt also having an abutment surface facing in the direction ofinward movement, spring means urging the bolt head outwardly of thecasing, a stop member and means for Cit guiding the stop member withinthe casing for sliding movement transverse to the movement of the boltbetween a position in which it lies in the path of said abutment surfaceand so acts to dead lock the bolt and a position in which it is clear ofthe bolt and leaves the bolt free for inward andoutward latchingmovement, a handle at one side of the casing, a connection between thehandle and the stop member for moving the member between the twopositions aforesaid comprising a cam rotatable by the handle andoperative to effect movement of the slide, a key operated lock of thetype having a rotatable barrel and a single key-insertion and removalposition, said key operated lock being accessible for operation at theopposite side of the casing, an operative connection between saidrotatable barrel and said stop member for moving the stop member betweenthe two positions aforesaid comprising a connection between the lockbarrel and the cam having sufi'icient lost-motion to enable the barrelto be turned without movement of the stop member to the key insertionand removal position after movement of the stop member to either of itstwo positions aforesaid and means for holding and locating the barrellock comprising a block of angular shape received within a corner of thecasing the block having a hole within which the barrel of the key lockis received and the wall at one side of the hole being split, and aclamping screw by which the split may be closed to cause the block togrip the barrel, which screw is accessible for operation from the frontof the casing and the edge of the door when the lock is in position.

References Cited in the file of this patent UNITED STATES PATENTS

